Pioneer Glass operated for a very short time in 1984 in the old Imperial factory after Imperial finally closed its' doors. So I would assume these pieces are harder to find.
5 1/4 across X 1 3/4 high
left: blue with a purple hue
right: purple
original labels : PIONEER GLASS/Bellaire,Ohio
mark: SIC (save Imperial committee)
Not the best pictures, poor lighting on my part. But the back "SIC" mark and the paper labels show and that's the main thing for me.